Stockholders' Equity (Schedule of Reclassifications out of AOCI) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 03, 2021	Sep. 27, 2020	Oct. 03, 2021	Sep. 27, 2020
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]
Net revenue	$ 290,150	$ 378,114	$ 916,886	$ 888,129
Cost of revenue	203,309	264,620	625,748	627,093
Research and development	23,472	24,529	69,887	65,412
Sales and marketing	36,176	39,794	109,731	107,209
General and administrative	14,056	16,467	45,084	45,082
Total before tax	12,783	31,749	65,761	37,324
Tax impact	(3,199)	(6,214)	(15,383)	(9,979)
Net income	9,584	25,535	50,378	27,345
Amount Reclassified from AOCI
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]
Net revenue	545	(1,614)	(407)	(595)
Cost of revenue	(1)	3	0	2
Research and development	12	27	56	32
Sales and marketing	(27)	167	50	95
General and administrative	(4)	24	13	10
Total before tax	525	(1,393)	(288)	(456)
Tax impact	(110)	293	60	96
Net income	$ 415	$ (1,100)	$ (228)	$ (360)